秦岭西段日本落叶松人工林生长规律研究

以秦岭西段小陇山林区的日本落叶松人工林为研究对象，在搜集大量资料数据的基础上，通过典型样地调查及树干解析对日本落叶松人工林的生长规律进行研究。结果表明，日本落叶松人工林胸径、树高连年生长量均在第8年达到最大值；材积连年生长量于20 a时达到最大，材积平均生长量在28 a时达到最大，整个日本落叶松人工林的数量成熟龄为28 a。分别5个地位级对日本落叶松人工林生长规律进行对比，各地位级日本落叶松胸径、树高连年生长量达到最大值的年龄大致都在第8年；胸径、树高、材积连年生长量最大值随着地位级的增大而逐渐推后，日本落叶松人工林各地位级的数量成熟龄集中在26~30 a之间。

Growth Law of Larix kaempferi Plantations in Western Qinling

Based on the data collected, the growing process of Larix kaempferi plantation in Xiaolongshan of western Qinling was investigated by using the method of stem analysis. The results showed that both current annual DBH increment and annual height increment reached the maximum values in the 8^th year, the current annual volume increment reached the maximum values at the age of 20 years, and the peak value of current annual volume increment appeared at age of 28 years. Hence, the quantitative maturity of L. kaempferi plantations is 28 years. Comparing the growing process of L. kaempferi plantations in five siteclasses, both current annual DBH increment and annual height increment of each site class reached the maximum values in the 8^th year. With the increasing of siteclass, the age of current annual DBH, height and volume increment reached the maximum would be postponed. Therefore, the quantitative maturity of L. kaempferi plantations in each siteclass occurred at the ages of 26-30 years.